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Polycarbonate resin composition pellets and process for manufacturing same

a technology of polycarbonate resin and composition pellet, which is applied in the direction of group 5/15 element organic compounds, instruments, lighting and heating apparatus, etc., can solve the problems of insufficient levels in practical use, insufficient attempts, and inability to achieve sufficient levels, etc., to achieve excellent color tone uniformity, reduce yellow tinge, and high light transmittance

Active Publication Date: 2014-12-11
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a polycarbonate resin composition pellet that has reduced yellow tinge without the need for an additive, and excellent light transmittance in a short wavelength region. This results in a light-guiding member that has uniform color tone. The method of this invention allows for the production of a polycarbonate resin composition pellet with these beneficial properties.

Problems solved by technology

By the way, in the anti-light incidence portion of a light-guiding member using the PC, light is liable to yellow and hence the color tone uniformity of a screen is hardly obtained.
However, the attempts are still insufficient and cannot be said to be at sufficient levels in practical use.

Method used

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  • Polycarbonate resin composition pellets and process for manufacturing same
  • Polycarbonate resin composition pellets and process for manufacturing same
  • Polycarbonate resin composition pellets and process for manufacturing same

Examples

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examples

[0107]The present invention is described more specifically by way of Examples below but the present invention is by no means limited to Examples below.

[Measurement of Viscosity-Average Molecular Weight (Mv)]

[0108]The viscosity of a methylene chloride solution at 20° C. was measured with an Ubbelohde viscometer and a limiting viscosity [η] was determined from the measurement, followed by the calculation of a molecular weight from the following equation.

[η]=1.23×10−5Mv0.83

[Measurement of Light Transmittance of Solution]

[0109]6.0 Grams of a PC pellet were weighed in a flask. Then, methylene chloride was poured into the flask so that the total volume became 50.0 mL, and the mixture was stirred until the PC was completely dissolved (concentration: 12 g / dL). The solution in which the PC had been completely dissolved and which had no concentration unevenness was charged into a transparent cell made of quartz glass having an optical path length of 5 cm and a width of 1 cm, and its light tr...

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Abstract

Provided is a polycarbonate resin composition pellet, which has a light transmittance at a wavelength of 380 nm of 97.0% or more when the light transmittance is measured by using a methylene chloride solution having a concentration of 12 g / dL, the solution being charged into a quartz glass cell having an optical path length of 5 cm, and which has a viscosity-average molecular weight (Mv) of from 11,000 to 22,000.

Description

TECHNICAL FIELD[0001]The present invention relates to a polycarbonate resin composition pellet and a method of producing the pellet, and more specifically, to a polycarbonate resin composition pellet to be used as a raw material for an optical member such as a light-guiding plate of a liquid crystal backlight unit and a method of producing the pellet.BACKGROUND ART[0002]A polycarbonate resin or resin composition (hereinafter sometimes abbreviated as “PC”) has been used as the light-guiding member of a small liquid crystal display from the viewpoints of its heat resistance and mechanical strength (see, for example, Patent Document 1). In general, the PC is granulated into a pellet at 240 to 270° C. by extrusion granulation, and the pellet is subjected to injection molding or extrusion molding to be molded into various members.[0003]By the way, in the anti-light incidence portion of a light-guiding member using the PC, light is liable to yellow and hence the color tone uniformity of a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08G64/06C08L69/00G02B1/04B29B9/12B29C48/04
CPCC08G64/06B29B9/12C08L69/00C08L2205/025C08L2205/03C08L2205/035G02B1/045C08K5/103C08K5/527C08K5/524C08L83/04B29B9/06B29C48/04F21S2/00
Inventor OKAMOTO, YOSHIOTANAKA, TAKAYOSHITAKIMOTO, MASAMIYAMAZAKI, YASUNOBU
Owner IDEMITSU KOSAN CO LTD
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